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Keystore::from_file

Read and decrypt a keystore file, returning the raw 32-byte private key.

Signature

pub fn from_file<F, P>(filename: F, password: P) -> anyhow::Result<[u8; 32]>
where
    F: AsRef<Path>,
    P: AsRef<[u8]>;

Example

use {
    anyhow::Result,
    dango_sdk::{Keystore, Secp256k1, Secret},
};
 
fn load() -> Result<Secp256k1> {
    let bytes = Keystore::from_file("./key.json", "hunter2")?;
    Secp256k1::from_bytes(bytes)
}

Parameters

filename — AsRef<Path>. Path to the JSON keystore file.

password — AsRef<[u8]>. Decryption password. Bytes, not necessarily UTF-8.

Returns

[u8; 32] — the raw private key bytes. Wrap with Secp256k1::from_bytes or Eip712::from_bytes.

Notes

  • The file is JSON: { pk, salt, nonce, ciphertext }. PBKDF2-HMAC-SHA256 with 600 000 iterations derives the AES-256-GCM key from password + salt.
  • Wrong password produces an AES-GCM authentication-tag error; the message does not distinguish "wrong password" from "corrupted ciphertext".
  • File I/O errors (missing file, permission denied) propagate as anyhow::Error.

See also